Composition of matter.



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COMPQSITION OF MATTER.

No Drawing.

Specification of Letters Patent.

' Patente -Ma 31, 1910.

Application filed May 15, 1909. Serial No. 496,314.

To all whom it may concern:

Be it known that I, WILLIAM JAMES TiioRoLn, a subject of the King of Great Britain and Ireland, residing at 93 Fleet street, in the city of London England, have invented a new and useful Composition of Matter, of which the following is a specification.

The present invention relates to a composition of matter and comprises an improved india rubber composition particularly adapted for use in rendering the air tubes of pneumatic tires orthe covers thereof in such cases when the air tubes are dispensed with, capable of automatically sealing up any puncture or incision caused therein and so preventing the escape of the'contained compressed air. 4

The composition consists of pure rubber held in suspension within a crude gas tar benzene solvent.

The solvent which is employed is a crude gas tar benzene having a high boiling point. The particularbenzene employed must also have the following characteristics :(a) specific gravity at 15 (1., .880; (b) refractive index at 20 (1, 1.5060; (0') distilling between 125 .C. and 180C, and (cl) flash point (open test) F. I

The usual coal tar solvent naphthahaving a boiling point of about 100 C. to 140 C matter consisting of 4.3% of pure rub is useless for the present inventioii and according to my experience success depends upon the employment of a benzene solvent which boils. from 125 C. to 180 C. for which purpose the proportions of hyd rocarbon of boiling point'below C. nust be relativel small.

It has been ascertained by long-contiinied experiment tl at a suitable composition for employment \vitlrair tu'bes'ot pneumatic tires for the purpose of rendering them selfhealing comprises pure para rubber 4.3% and solvent 95.7%.

I claim 1. The herein described composition of matter consisting of pure rubber dissolved in a crude gas tar benzene distilling between C. and C. as set forth.

.2. The herein' described composition of dissolved in 95.7 of a crude gas tar b'enz distilling between 125 C. and 180 C set forth. 1

In testimony whereof I have hereunto signed my name in the presence of two subscribing witnesses.

WILLIAM JAMES THOROLD. Witnesses:

EDWARD LESLIE GEORGE, H. D. JAMEsoN. 

